1 贵州大学化学与化工学院，贵阳 550025
2 贵州省化工研究院，贵阳 550000
以工业固体废弃物赤泥(RM)为原料，经还原煅烧和接枝改性，制备得到一种醇胺钛酸酯改性的磁化赤泥吸附材料(ATMMRM)。利用XRD、FT-IR、SEM、BET、VSM等测试方法对RM和ATMMRM进行表征和对比，发现ATMMRM表面成功引入了羟基和胺基官能团，而且其比表面积及饱和磁化强度较RM分别提高6.0倍和9.6倍，这些特性为ATMMRM提供了更多活性吸附位点并赋予了材料磁分离能力。对Pb(Ⅱ)的静态吸附实验结果表明，在pH=6，T=25 ℃条件下，ATMMRM对水体中Pb(Ⅱ)的饱和吸附容量达213 mg·g-1，吸附过程符合Langmuir等温吸附模型和准二级动力学方程，为自发、吸热、熵增的化学吸附控制过程，吸附机理主要为物理吸附以及ATMMRM表面接枝的羟基和胺基与Pb(Ⅱ)的螯合作用。
赤泥改性 磁性 吸附 螯合 red mud modified magnetic Pb(Ⅱ) Pb(Ⅱ) adsorption chelation
1 1. Department of Chemistry, College of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
2 2. Department of Chemistry, Faculty of Science, Al-Hussein Bin Talal University, P.O. Box 20 Ma’an, Jordan
3 3. Department of Chemistry, Faculty of Science, Zagazig University, Egypt
The four isolates solid complexes: [La(RHC)(NO3)2]·3H2O, [Nd(RHC)(NO3)2]·4H2O, [Eu(RHC)(NO3)2]·2H2O, and [Ce(RHC)(NO3)2]·5H2O that obtained by the reaction of the nitrate salts of the Ce(Ⅲ), Eu(Ⅲ), Nd(Ⅲ) and La(Ⅲ) ions and rhodamie C (RHC) ligand were interpretative using elemental analysis (C, H and N), molar conductivity, infrared, electronic, fluorescence and 1H-NMR spectra to achieve the speculated suitable formula. The low molar conductance values of the synthesized RHC complexes concluded the non-electrolytic behavior. The infrared spectra recorded the absence of stretching vibration ν(OH) of the —COOH and presence of two new vibration bands at 1 597~1 601 and 1 383~1 399 cm-1 which were assigned to νas(COO-) and νs(COO-). The difference between them revealed that the carboxylate group acts as a bidentate ligand. 1HNMR spectra of Europium and lanthanum(Ⅲ) complexes were supported the FTIR results based on the absent of proton of the carboxylic group. Therefore, the microanalytical and spectroscopic results deduced that RHC acts as a monobasic bidentate ligand, and coordinated to the central metal(Ⅲ) ions via the two oxygen atoms of deprotonated carboxylic group. Fluorescence studies were performed on the metal complexes of Ce3+, Tb3+, Th4+, Gd3+ and La3+, that referred a quenching in the fluorescene intensity of rhodamine C in the aqueous state after complexation. The antimicrobial assessment against some kind of bacteria and fungi were also checked and recorded enhancement in case of their complexes.
Rhodamine C Chelation Spectroscopic Thermogravimetric Lanthanides 光谱学与光谱分析
2021, 41(10): 3311
Te(Ⅳ), Se(Ⅳ), V(Ⅲ), Nb(Ⅴ) and Ta(Ⅴ) complexes of indole-3-acetic acid (IAAH) ligand were synthesized, characterized by elemental analysis and various spectroscopic techniques like, IR, 1H-NMR, X-ray powder diffraction, UV-Visible, thermogravimetry analysis, magnetic measurements, molar conductance and surface morphology using SEM. All the synthesized complexes of IAAH ligand have 1∶2 stoichiometry of the types [Te(IAA)2(NH3)2]·2Cl (Ⅰ), [Se(IAA)2(NH3)2]·2Cl (Ⅱ), [V(IAA)2(NH3)(Cl)] (Ⅲ), [Nb(IAA)2(Cl)3] (Ⅳ), and [Ta(IAA)2(Cl)3] (Ⅴ). Spectral analysis indicates octahedral geometry for the Te(Ⅳ), Se(Ⅳ) and V(Ⅲ) complexes, whereas both Nb(Ⅴ) and Ta(Ⅴ) have a seven-coordination. The bonding sites are the oxygen atoms of carboxylate group for the deprotonated indole-3-acetic acid (IAA) ligand. The thermogravimetry analysis studies gave evidence for the presence of other coordinated molecules (Cl or NH3) in the composition of IAA complexes, which were further supported by IR and micro analytical measurements. The higher molar conductance data of tellurium and selenium (Ⅳ) complexes reveal that these chelates are electrolytes, while low conductivity values for the vanadium(Ⅲ), niobium and tantalum(Ⅴ) chelates indicated a non-electrolytes. To test the antibacterial property of the five complexes in this study, four bacterial strains Klebsiella (G-), Escherichia coli (G-), Staphylococcus aureus (G+) and Staphylococcus epidermidis (G+) were used in the investigation. The effects of the five complexes in the cytotoxicity of Caco-2 and Mcf-7 human cancer cell lines were studied Neutral red uptake assay for the estimation of cell viability/cytotoxicity protocol.
Indole-3-acetic acid chelation IR Metal ions TEM Antimicrobial test 
